#include <stdio.h>
#include <stdlib.h>

int main()
{
	int num = 0;
	char ch;
	printf("please input:");
	ch = getchar();
	if(ch >= '0' && ch <= '9')printf("number\n");
	else if((ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z'))printf("letter\n");
	else printf("special character\n");
	return 0;
}
